This document provides practical guidance for professionals involved in measuring and verifying energy performance in commercial buildings and industrial facilities. Measurement and verification (M&V) practitioners can use the guidance to enhance data accuracy, isolate the impacts of energy-saving measures, and increase investor and stakeholder confidence in the reported results. This unique document covers all critical aspects of energy data M&V, including minimum reporting measures, formats, statistical methods, data quality levels, cost implications, and strategies for managing uncertainty.